Thermage FLX in Seoul (Hongdae): Radiofrequency Skin Tightening
Thermage FLX is an FDA-cleared monopolar radiofrequency treatment that heats the deeper skin layers to tighten existing collagen and stimulate new collagen. It suits mild to moderate skin laxity on the face, eyes and neck. There is little downtime, results build over 2 to 6 months, and a doctor at KLEAM Clinic Hongdae decides whether it fits your skin.
✦ Medically reviewed by the KLEAM Medical Team · Last updated:
Key facts at a glance
- Treatment time
- Typically 45–90 min
- Comfort
- Numbing cream; brief deep heat pulses
- Downtime
- Little to none; mild redness for hours
- Results visible
- Some tightening early; full results in 2–6 months
- How long it lasts
- Often about 1–2 years
- Recommended sessions
- Usually 1 session
Who it suits
- Mild to moderate sagging along the jawline and cheeks
- Loose or crepey skin around the eyes
- Early neck laxity
- People who want tighter skin without surgery or long downtime
- Visitors who want a one-session treatment during a short stay
Please consult us first if
- Pregnant or breastfeeding
- Pacemaker or implanted electronic devices
- Active skin infection or open wounds in the area
- Severe sagging that may need surgical lifting — the doctor will advise
How it works
Thermage FLX delivers monopolar radiofrequency energy through a disposable tip while cooling the skin surface. The heat reaches the deeper dermis and connective tissue, causing existing collagen fibers to contract and starting a healing response that builds new collagen over the following months.
The FLX system uses an updated tip and an algorithm that adjusts energy pulse by pulse, aiming for even heating. You will feel short pulses of deep heat followed by cooling; numbing cream makes this more comfortable.
Most people see some firmness soon after, but the main tightening appears gradually over 2 to 6 months. Results vary with age, skin quality and lifestyle.
How it compares
| Compared with | Difference |
|---|---|
| Ultherapy | Ultherapy uses focused ultrasound to reach the deeper SMAS layer for lifting, while Thermage FLX uses radiofrequency to tighten skin more broadly, including around the eyes. |
| Shurink | Shurink is a Korean HIFU device often used for lifting with shorter treatment times, while Thermage FLX focuses on overall skin tightening and texture. |
Your visit, step by step
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Message us on WhatsApp or KakaoTalk
Send a photo of the area you want to improve, your travel dates and any questions about Thermage FLX. Our English-speaking staff will suggest a time slot and confirm your booking.
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Arrive at Hongik Univ. Station Exit 1
We are on the 3rd floor of L7 Hongdae by LOTTE, 141 Yanghwa-ro, Mapo-gu, right by Exit 1 (Line 2, AREX and Gyeongui-Jungang Line). If you come straight from Incheon Airport, the Airport Railroad stops here.
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Consultation in English
A doctor examines your skin, reviews your medical history and medications, and explains whether Thermage FLX suits you, what results are realistic, and any alternatives. Japanese-friendly support is also available.
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Your treatment
After cleansing and, where needed, numbing, the doctor performs Thermage FLX. We check comfort throughout and explain what you will see in the mirror right afterwards.
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Aftercare and flight tips
There is little downtime, so flying the next day is generally fine. Keep your skin moisturized on the plane and use sunscreen; results will continue to develop after you return home.
Aftercare & travel tips
- Mild redness or swelling usually settles within hours to a day
- Use a gentle cleanser and moisturizer for a few days
- Apply SPF 50 sunscreen daily
- Avoid saunas and very hot baths for about 2 days
- Flying the next day is generally fine; moisturize often in the cabin
Frequently asked questions
Is Thermage FLX painful?
Most people feel brief pulses of deep heat, followed by cooling. Numbing cream is applied beforehand and the energy can be adjusted to your comfort. Many describe it as uncomfortable but tolerable, and the sensation stops when the pulse ends.
When will I see results?
Some firmness may be noticed soon after treatment, but the main tightening develops gradually as new collagen forms over about 2 to 6 months. This means visitors often see the full result after they return home. If you have any questions before booking, message us on WhatsApp or KakaoTalk and our English-speaking staff will help.
How long do results last?
Results often last about 1 to 2 years, depending on age, skin quality, sun exposure and lifestyle. Many people repeat Thermage once a year or combine it with other lifting or booster treatments to maintain the effect. If you have any questions before booking, message us on WhatsApp or KakaoTalk and our English-speaking staff will help.
Can I fly after Thermage FLX?
Yes, flying the next day is generally fine because there is little downtime. Mild redness usually fades quickly. Keep your skin moisturized during the flight and use sunscreen afterwards. If you have any questions before booking, message us on WhatsApp or KakaoTalk and our English-speaking staff will help.
How much does Thermage FLX cost in Seoul?
The price depends on the area and the number of shots used for your face, eyes or neck. Please message us on WhatsApp or KakaoTalk, and our staff will share current prices and help you choose the right number of shots.
Can I combine Thermage with Ultherapy or fillers?
Yes, Thermage is often combined with ultrasound lifting, Botox, fillers or skin boosters. The doctor will plan the order and timing so that each treatment works safely and effectively. If you have any questions before booking, message us on WhatsApp or KakaoTalk and our English-speaking staff will help.
Last updated: 2026-10-01. This page is for general information and is not a diagnosis. Suitability, dosage and results vary by person and are decided with a doctor at your consultation.
Why international patients choose KLEAM
Visit us
KLEAM Clinic Hongdae
3F, L7 Hongdae by LOTTE, 141 Yanghwa-ro, Mapo-gu, Seoul
Right by Hongik Univ. Station Exit 1 (Line 2 · AREX · Gyeongui-Jungang)
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+82-10-7368-4441
Weekdays 10:30–20:30 · Weekends 10:30–17:00 · No lunch break
Explore popular treatments
Thermage FLX in Hongdae – Firm, Tighten, and Lift with Next-Generation RF Technology
Looking for a non-invasive way to lift sagging skin and redefine your facial contours? Thermage FLX is one of the most advanced skin tightening treatments available today, using radiofrequency (RF) energy to stimulate collagen deep within the skin. At our clinic in Hongdae, Thermage FLX is performed by experienced professionals to deliver smoother, tighter, and more youthful-looking skin—with no downtime.
What Is Thermage FLX?
Thermage FLX is the latest generation of Thermage technology that delivers monopolar RF energy deep into the dermis to heat collagen-rich tissue. This process triggers immediate collagen contraction and long-term remodeling, leading to visible tightening and lifting over time.
Thermage FLX is commonly used to treat:
- Sagging jawline and jowls
- Fine lines and crepey skin around the eyes
- Loose neck skin and horizontal neck lines
- Nasolabial folds and marionette lines
- Skin laxity on the cheeks and midface
- Wrinkled or aging skin on the abdomen, arms, and thighs
Why Choose Thermage FLX?
Key Benefits:
✅ Non-surgical, single-session treatment
✅ No downtime—resume daily life immediately
✅ Gradual, natural-looking tightening and lifting
✅ Stimulates long-term collagen production
✅ Suitable for the face, eyes, neck, and body
✅ Clinically proven results that last 6–12 months
✅ Enhanced comfort and speed with AccuREP™ technology
How Is Thermage FLX Different from Other Lifting Devices?
Thermage FLX uses a unique deep-heating RF technology that targets the collagen layer without damaging the skin’s surface. Compared to HIFU (like Shurink or Ultherapy), Thermage is:
- Better for surface-level crepiness and texture improvement
- Ideal for sensitive areas like the eyes
- Delivered in one comprehensive session, not multiple treatments
- Equipped with cooling and vibration features for greater comfort
What to Expect During Treatment
- Skin is cleansed and marked for precision
- A cooling gel is applied to protect the outer layer of the skin
- The Thermage FLX handpiece delivers controlled RF pulses with vibration and cooling
- You may feel a warm sensation with each pulse, but treatment is well-tolerated
The session typically lasts 45–90 minutes, depending on the area treated.
Who Is a Good Candidate for Thermage FLX?
You may be a good candidate if you:
- Have mild to moderate skin laxity
- Want to delay or avoid surgical facelifts
- Are looking to improve skin texture and tightness non-invasively
- Are not pregnant or have metal implants in the treatment area
- Want long-lasting collagen remodeling with minimal risk
Thermage is safe for all skin types and tones.
Are There Any Side Effects or Downtime?
Thermage FLX is known for its minimal side effects and no downtime. You may experience:
- Mild redness or swelling for a few hours
- Temporary sensitivity or tingling
- Rare bruising in delicate areas
Most patients return to normal activities immediately after treatment.
How Long Do Results Last?
- Initial firmness may be felt right away
- Full lifting and tightening effects develop gradually over 2–6 months
- Results can last up to 12 months or longer depending on age, lifestyle, and skincare
Annual maintenance sessions are often recommended to preserve collagen levels.
Can Thermage FLX Be Combined With Other Treatments?
Yes! Thermage FLX is often used in conjunction with:
- Botox or fillers for enhanced anti-aging and facial contour
- Thread lifting for added lift and structure
- Laser toning or IPL for pigment correction
- Skin boosters (Rejuran, exosomes) for improved texture and glow
A multi-modality approach ensures optimal, natural-looking facial rejuvenation.
Book Your Thermage FLX Session in Hongdae Today
Experience the gold standard in non-invasive skin tightening.
Schedule your Thermage FLX consultation at our Hongdae clinic today and discover firmer, lifted, and more youthful skin—without needles, downtime, or surgery. Let your skin bounce back with the power of collagen.
